Delamination and Adhesion of coatings and thin films.
Michel Ignat DR Centre National de la Recherche Scientifique; LTPCM ENSEEG Institut National Polytechnique de Grenoble. BP 75 Domaine Universitaire 38402 Saint Martin d'Hères France. Phone: 33 (0) 476826606- Fax: 33 (0) 476826745- Email:michel..ignat@inpg.fr
The use of thin films and coatings expands contineously. Nowadays it includes rather different technological applications as the ones related to tribological applications, microelectronics or biotechnologies. However, to consider any of the mentioned applications, a certain number of problems have to be understood and solved. Indeed, film on substrate systems are subjected to internal stresses produced by thermoelastic mismatch, or to external mechanical stresses applied monotonically or cyclically. Then they are likely to be damaged by mechanisms that produce bulk and/or interfacial delamination failures An analysis of the mechanical stability of a film on a substrate system will be presented.. The film on substrate consisted of a titanium oxyde layer, deposited on a polycarbonate substrate. The analysis is based on in-situ microtensile tests, which allow to follow how the film develops irreversible damage (cracking and deadhesion), when progressively pulled in tension. Following ?in-situ? this degradation, the critical parameters which correspond to the initiation of a irreversible damage mechanism can be determined. *a recorded sequence of the progressive degradation mechanisms will be shown.
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